diff --git a/packages/optimizely-sdk/CHANGELOG.MD b/packages/optimizely-sdk/CHANGELOG.MD
index 8d61f7778..474dea1ab 100644
--- a/packages/optimizely-sdk/CHANGELOG.MD
+++ b/packages/optimizely-sdk/CHANGELOG.MD
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [4.0.0-alpha.1] - March 4, 2020
+
+### Breaking Changes:
+- Removed `Promise` polyfill from browser entry point ([417](https://github.com/optimizely/javascript-sdk/pull/417))
+
 ## [3.6.0-alpha.1] - March 4, 2020
 
 ### New Features
diff --git a/packages/optimizely-sdk/lib/index.browser.tests.js b/packages/optimizely-sdk/lib/index.browser.tests.js
index d19746b82..19107fb19 100644
--- a/packages/optimizely-sdk/lib/index.browser.tests.js
+++ b/packages/optimizely-sdk/lib/index.browser.tests.js
@@ -147,7 +147,7 @@ describe('javascript-sdk', function() {
         optlyInstance.onReady().catch(function() {});
 
         assert.instanceOf(optlyInstance, Optimizely);
-        assert.equal(optlyInstance.clientVersion, '3.6.0-alpha.1');
+        assert.equal(optlyInstance.clientVersion, '4.0.0-alpha.1');
       });
 
       it('should set the JavaScript client engine and version', function() {
diff --git a/packages/optimizely-sdk/lib/index.node.tests.js b/packages/optimizely-sdk/lib/index.node.tests.js
index 333650d54..c0a543618 100644
--- a/packages/optimizely-sdk/lib/index.node.tests.js
+++ b/packages/optimizely-sdk/lib/index.node.tests.js
@@ -92,7 +92,7 @@ describe('optimizelyFactory', function() {
         optlyInstance.onReady().catch(function() {});
 
         assert.instanceOf(optlyInstance, Optimizely);
-        assert.equal(optlyInstance.clientVersion, '3.6.0-alpha.1');
+        assert.equal(optlyInstance.clientVersion, '4.0.0-alpha.1');
       });
 
       describe('event processor configuration', function() {
diff --git a/packages/optimizely-sdk/lib/index.react_native.tests.js b/packages/optimizely-sdk/lib/index.react_native.tests.js
index a12a0673b..a1fc9010d 100644
--- a/packages/optimizely-sdk/lib/index.react_native.tests.js
+++ b/packages/optimizely-sdk/lib/index.react_native.tests.js
@@ -92,7 +92,7 @@ describe('javascript-sdk/react-native', function() {
         optlyInstance.onReady().catch(function() {});
 
         assert.instanceOf(optlyInstance, Optimizely);
-        assert.equal(optlyInstance.clientVersion, '3.6.0-alpha.1');
+        assert.equal(optlyInstance.clientVersion, '4.0.0-alpha.1');
       });
 
       it('should set the React Native JS client engine and javascript SDK version', function() {
diff --git a/packages/optimizely-sdk/lib/utils/enums/index.js b/packages/optimizely-sdk/lib/utils/enums/index.js
index 523cd13c6..a0e4d4435 100644
--- a/packages/optimizely-sdk/lib/utils/enums/index.js
+++ b/packages/optimizely-sdk/lib/utils/enums/index.js
@@ -176,7 +176,7 @@ exports.NODE_CLIENT_ENGINE = 'node-sdk';
 exports.REACT_CLIENT_ENGINE = 'react-sdk';
 exports.REACT_NATIVE_CLIENT_ENGINE = 'react-native-sdk';
 exports.REACT_NATIVE_JS_CLIENT_ENGINE = 'react-native-js-sdk';
-exports.NODE_CLIENT_VERSION = '3.6.0-alpha.1';
+exports.NODE_CLIENT_VERSION = '4.0.0-alpha.1';
 
 exports.VALID_CLIENT_ENGINES = [
   exports.NODE_CLIENT_ENGINE,
diff --git a/packages/optimizely-sdk/package-lock.json b/packages/optimizely-sdk/package-lock.json
index 477f8631c..3530711b2 100644
--- a/packages/optimizely-sdk/package-lock.json
+++ b/packages/optimizely-sdk/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@optimizely/optimizely-sdk",
-  "version": "3.6.0-alpha.1",
+  "version": "4.0.0-alpha.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/packages/optimizely-sdk/package.json b/packages/optimizely-sdk/package.json
index 3c72b9ae3..12d13651a 100644
--- a/packages/optimizely-sdk/package.json
+++ b/packages/optimizely-sdk/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@optimizely/optimizely-sdk",
-  "version": "3.6.0-alpha.1",
+  "version": "4.0.0-alpha.1",
   "description": "JavaScript SDK for Optimizely X Full Stack",
   "main": "lib/index.node.js",
   "browser": "lib/index.browser.js",